tapping board
... 脾气发作 tantrum 敲击板 tapping board 敲击测验 tapping test ...
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还可以用尖嘴器具敲击板材表面，如果生意差异较大，就说明内部有空洞。
Jianzui apparatus can also use percussion sheet surface, if the difference between larger business, the internal cavity.
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